1904] CURRENT LITERATURE 231 
epidermis, which forms the outermost, enters into the formation of a root sheath. 
The first root forms an angle of about go° with the axis of the shoot. A subse- 
quently formed adventitious root, which continues the shoot axis, exceeds the 
primary in growth and becomes the principal root at least fora time. The origin 
of cortex, cap, and sheath in P. canartensis is the same as in A. Alexandrae, but 
the axis of the primary root coincides with that of the shoot, so that the first root 
remains the principal one.—F. H. BriLirncs. 
Grrasstmow>? has investigated the influence of the nucleuson the growth of 
the cell. By exposing various species of Spirogyra with cells in the process of 
division for one-half an hour to one hour to a temperature a little above 0° C., he 
was able so to interfere with the processes of, mitosis that the following irregu- 
larities arose when the filaments were transferred and cultivated under normal 
al is greater than the average growth of 
normal cells; the non-nucleate cells are Gat lived and the growth ie slight; 
oy oe ambers are longer-lived and grow more than the non-nucleate 
’ ving an excess of nuclear material may conjugate either with 
normal cells or with cells similar to themselves.—C. F. Horres. 
“ ca has described the most important insects and fungous enemies 
The following are noted here for refer- 
an whose systematic position is not 
ERASSIMOW, J. J.,Zur Physiolog; 
mie “ ap a der Zelle. Bull. Soc. Imp. Nat. Moscow. 
ZMMERMANN A., Eini i i 
tn 2 ear pathologische en physiologische Waarnemingen over 
Mededel. lantentuin, no, 67. pp. 105. pls. 4. 1904. 
